Ig vs immune globulin

Ig and immune globulin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ig	Yes	No	No	No
immune globulin	Yes	No	No	No

As nouns, Ig and immune globulin are synonyms defined as:

Ig and immune globulin: a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response

Other synonyms of Ig include immune gamma globulin, immune serum globulin, immunoglobulin.

Ig (noun)	immune globulin (noun)
a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response	a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response